Product Description:

The PMB31D-00216-01 brushless servomotor is manufactured by Pacific Scientific and belongs to the PMB Brushless Servomotors series. It is intended for integration with servo drives that regulate torque and velocity in automated pick-and-place heads, palletizers, and light machining centers. By supplying commanded motion while maintaining consistent feedback, the motor serves as an electromechanical actuator within precision industrial automation. Its brushless design supports smooth response during frequent start-stop cycles that are common in repetitive indexing and transfer operations. This makes the motor suitable for machines that need accurate motion in a compact working area.

The motor frame corresponds to NEMA size 34, giving it a 3.4-inch square mounting face compatible with many standard gearheads and brackets. Position feedback is delivered by a high-resolution encoder rated at 4096 ppr, allowing the drive to resolve angular increments smaller than one tenth of a degree. When energized from a 240 VAC amplifier, the stator can sustain a nominal stall winding current of 5.4 ARMS. This value helps establish continuous current limits and thermal loading inside the drive. Commutation and incremental signals come from a single digital encoder with commutation, eliminating separate Hall sensors and reducing cable count. Electrical power, feedback, and shield drains exit the enclosure as flying leads with MS connectors, so wiring can be routed through tight machine frames without bulky terminal housings.

A factory-installed shaft seal protects the front bearing by limiting oil or coolant migration along the shaft when the motor is coupled to pumps or enclosed gear trains. It also helps keep the front bearing area cleaner in enclosed machinery that is exposed to light contamination. The output shaft has a flat, providing a secure surface for set-screw couplings without the added cost of a keyway. Magnetic material is arranged in a stack length multiple of 1, the shortest configuration for this frame, which helps keep rotor inertia low for rapid acceleration. This arrangement works well in compact equipment footprints where repeatable motion and straightforward shaft coupling are important during continuous operation.